It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Denmark has twice as many pigs as there are people.
66
Only about 2% of the world population has green eyes.
36
About two hundred babies are born worldwide every minute.
237
There are approximately three chickens for every human on Earth.
13
Nearly half of the entire world's adult population has never drunk alcohol.
12
If the population of China walked past you, in single file, the line would never end because of the rate of reproduction.
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